Evaluate the following expression using the values given: Find 4x - y - 2z if x = -2, y = 3, and z = -2 HELP HELP HELP

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Evaluate the following expression using the values given: Find 4x - y - 2z if x = -2, y = 3, and z = -2 HELP HELP HELP

Mathematics
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Other answers:

Just substitute the numbers given to you into the equation.
\[4(-2)-(3)-2(-2)\]
TY IS -7
ITs##
can you help with another
The radius of a cone-shaped tank is 4 feet less than its height. If the height of the tank is (x - 3) feet, the expression below shows the volume of the tank: 1 over 3π(x - 7)2 (x - 3) What does the factor π (x - 7)2 represent?
u have no clue'
i
Radius is 4 less than the height... write that as it reads, 'is' means equals r = h - 4
Height is (x-3) h = x - 3
The total surface area of the tank The area of the curved sides of the tank The area of the circular base of the tank The area of the base of about three such tanks
so would it be the 3ed one
The volume of a Cone is \[V = \frac{ 1 }{ 3 }\pi*r^2*h\]
insert in the values and solve
The radius is measured from the wide base of the cone
oh ok so d
If the radius is height minus 4 and the height is x - 3 r = h - 4 h = x - 3 sub in h for the radius r = (x-3) - 4 = x - 7
They want to know what pi*(x-7)^2 represents... in other words now that you have r = x - 7 the question is , what is pi*r^2
you lost me
ok, the givens in the problem are, r = h -4 (radius is 4 less than height) h = x - 3 (height is x - 3
you get that part?
yea
To combine those two, you can take the h = x - 3, and insert that into the radius r = h - 4 = (x-3) - 4 r = x - 7 so the radius is in terms of X now, not the height
good?
no
The radius is given in terms of the height of the cone... the height is given in terms of a measurememt X... is is one of those compound functions like.. r [ h(x)] You use the height value in the radius , to get r(x), the radius in terms of the measure X instead of height h
i understand but What does the factor π (x - 7)2 represent
i understand how you solved it but how doo i answer the question
The volume of a cone is \[V = \frac{ 1 }{ 3 }\pi*r^2*h\]
recall, the area of a circle is A = pi*r^2 So the Volume of the cone is, 1/3 * ( area of circle base) * (height)
yea ok
pi times the radius squared is the area of the base in this instance
so its c
like i said
\[V = \frac{ 1 }{ 3 }\pi*r^2*h = (area ~base)*\frac{ height }{ 3 }\]
i didnt look at the answers
The total surface area of the tank The area of the curved sides of the tank The area of the circular base of the tank The area of the base of about three such tanks
i understand the problem no but i wanted to clarify
a, right on, yeah C
tytytytytyty so much

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